After suspecting that Mermaid Man has been kidnapped, Barnacle Boy, SpongeBob, and Patrick go to Atomic Flounder's Home, where they don't find Mermaid Man. The next stop is Jumbo Shrimp's House, where they find him pretending to fight an inflatable bop bag of Mermaid Man. Later, Atomic Flounder, the Dirty Bubble, and Man Ray show up, they all have a meal, and then complain about how Barnacle Boy, SpongeBob, and Patrick ruined their heist plan (Man Ray and Atomic Flounder), cake (Dirty Bubble), and bop bag. They agree that they need to get revenge. Soon, the four are waiting to pounce on Barnacle Boy, SpongeBob, and Patrick. The four do so and later tie the three up to chairs at Jumbo Shrimp's house. SpongeBob asks what the four are going to do to the three. Jumbo Shrimp suggests a spanking machine. Soon, Mermaid Man shows up with a present for Barnacle Boy because it is his birthday. Soon, Mermaid Man is also tied up to a chair. Soon, the villains are ready to get their revenge. However, Barnacle Boy, whose present was a harmonica, plays his harmonica while SpongeBob and Patrick sing a birthday song for Barnacle Boy. The villains don't like this and let the heroes go.